How to remove a red text from a greyscale image?!

Question

Mariam Sheha 2016-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/276971-how-to-remove-a-red-text-from-a-greyscale-image

评论： Mariam Sheha 2016-4-8

采纳的回答： Walter Roberson

Hello my friends;

hope you are all doing well,,

i'd like to ask how can i segment or remove a red text from grey scal image?!

i think about making a for loop and if condition so that if found the red color (1,0,0) will convert it to white but it doesn't work?! can you please check that with me or tell me about another solution for that! (i am using matlab 7.10)

example of the image i am talking about is attached!

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Answer 1

Walter Roberson 2016-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/276971-how-to-remove-a-red-text-from-a-greyscale-image#answer_216310

Convert to HSV. The range of hues for the red will be very different than the range of hues for the grayscale.

Now, take one pane of the image, and double() it. Use the locations where red were detected and assign NaN to the array just mentioned. Now you can use John D'Errico's inpaint_nan File Exchange Contribution.

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Mariam Sheha 2016-4-8

Ass_filt_diff.m

Thanks A lot it works out and your idea also guided ne out to work out with the R component of the RGB image and it also works when subtracting from the RGB image...

Now i want to ask about completing my task to inprint image ...i segment it out and then added low pass filter gaussian and now i want to remove the blurred pixels replacing it by the known correct one .....how do you think i can do that?! The code is attached

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